A theoretical study has been made of the relationships between natural gas composition and vehicle power, tune condition, fuel consumption and range. Results are presented for five gas compositions that are either currently available in New Zealand or could be in the future. These are: treated Kapuni, Maui (D and C sands) and gases with the gas liquids either wholly or partially removed. The study indicates that with optimized engine tuning the full throttle power output for the various gases should not differ by more than 2%. Fuel consumption rates, compared with Kapuni, would be 11% higher with Maui D, 8% higher with Maui C, 8% higher with a partially stripped gas and 12% higher with a fully stripped gas. Vehicle range, assuming a constant storage cylinder size and filling pressure, compared with Kapuni, would be 6% less with Maui D, 9% less with Maui C, 16% less with a partially stripped gas and 22% less with a fully stripped gas. Practical power and fuel consumption tests have been conducted on two vehicles using Kapuni and Maui (D) gases. Results confirm the prediction that, with optimum engine tuning, there should be no perceptible difference in the full throttle power between the gases. Fuel consumption results have indicated that the relative consumption rates of the various gases may vary significantly as a result of individual engine design and CNG conversion system performance differences.

  • Corporate Authors:

    New Zealand Energy Res & Devel Committee

    Wellington,   New Zealand 
  • Authors:
    • Jones, K
    • Raine, R R
  • Publication Date: 1983-12

Media Info

  • Pagination: 35 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00389143
  • Record Type: Publication
  • Report/Paper Numbers: NZERDC-P-80
  • Files: TRIS
  • Created Date: Oct 30 1984 12:00AM